Pump for drawing and measuring liquid.



H. L. DARWOOD. I PUMP FOR DRAWING AND MEASURING LIQUID. v APPLICATIONFILED FEB. 26,1909. 928,03 1

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Patented July 13, 1909.

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al'npllavulpvlalau Sim/9mm f HENRY L. DARWODD, OF PHILADELPHIA,PENNSYLVANIA.

PUMP FOR DRAWING AND MEASURING LIQUID.

. Specification of Letters Patent.

Patented July 13, 1909.

Application filed February 26, 1999. Serial No. 480,265.

fl '0 all whom it may con cern:

3e it known that I, HENRY L. DARWOOD, a citizen of the United States,residing at the city of Philadelphia, in the county of Philadelphia andState of Pennsylvania, have invented a new and useful Pum for Drawingand Measuring Liquids, of whlch the follow ing is a specification.

My invention relates to improvements in pumps for elevating 01' drawingand measuring all kinds of liquids, and es ecially alcoholic liquors tobe sold overa er; and the objects of my improvements are to rovide apump for drawing liquid from a arrel or ot receptacle located below theroom in which the pump is located, and to provide the latter with meansfor indicating the accurate amount of liquid drawn.

My invention will be more fully. understood taken in connection with theaccom anying drawings forming part hereof, an in which: v

Figure 1, is a diagrammatic view showing the location of the pump-head,Jump-cylinder, piping, aspear and a' barrel into which the latter isinserted. Fig. 2, is a vertical central section through thepump-cylinder,

piston and valves in said piston, and also the pipes. Fig. 3, is aversuctionv and supply through a spear adapted tical central sectlon tobe inserted through the bung-hole and into a barrel, and showing twovalves. Fig. 4, is a vertical section through the pump-head,

showing the means for operating the piston,

locking devices for permitting the piston-rod to travel only in one andthe same direction unt1l the upor down-movement of the rod is completed,means for shifting said locking devices at the end of each movement, andmeans for indicating the number of strokes of the piston. Fig. 5, is asection on the line 5-5 0 Fig. 4. F g. 6, is a section on the line 6-6of Fig. 4. Fig. 7, is a section on the line 7-7 of Fig. 4'. Fig. 8, is asection on the line 8 8 of Fig. 4, and Fig. 9 is a section on the line99 of Fig. 4.

Referring now to the drawings for a further description of my invention,and more particularly to Fig. 1, A is the pump-head o'r casing, in whichthe devices for operating and locking the'piston-rod 5 is contained. Inone side of the pump-head is formed a hollow shaft a with spout a,through which the rod and b 'is a pipe communicating with rod b to drawli ui t e full distance.

the cylinder B and hollow shaft a in the pump-head. b is a pipesecured'at one end to the lower end of the pump-cylinder B and at itsother end to a flexible metallic tubing 1), to which the spear C isattached, and D is a barrel from which the liquid is to be drawn.

the lower end and provided at this end. with a series of holes 0 topermit the liquid to enter the pipe; at the upper end of the spear issecured a head, in. which two tight-fitting metallic checkvalves c and care seated. (Fig. 3).

The pump-cylinder B is of any preferred construction and contains thepiston I) having seated therein two check-valves b (Fig. 2-) and thispiston l) is o )erated by the pistonfrom the barrel D, through the spearflexible metallic tubing 6 ipe'b, cylinder B, pipe b hollow shaft a anspout (1, To actuate the piston-rod N, a gear-rack e is secured to thetop of the piston-rod b and is mounted in a guide-way of the pump-headA, (Figs. 1, 4,5, 6 and 7). A gear-wheel e journaled in the head Ameshes with said rack e and is operated by the crank e which whenrotated in the direction as indicated by the arrow in Fig. 4 elevatesthe rack e,'and rotating the same inthe opposite direction will forcethe rack e and piston-rod b downward. In order to accurately measure thequantity of liquid drawn by the pump, it becomes necessary to absolutelycontrol the movement of the piston and itsrod, that is to say the pistonmust travel a certain distance and at the end of this distance it must 0erate an indicator to showthat it did travel If the endof this'distanceis not reachedthere must he means to prevent a retrograde movement untilthat certain distance has been traveled, when the The spear C iscomposed of a pipe 0, closed at i indicator will be automaticallyactuated at x the completion of such full stroke of the pistonandindicate that a certain amount of iquid has-been drawn from the barrelD.

I'obtain these results by means of two pawls i andi hinged on a shaft'1', and a switchlever i fulcrumed on the same shaft 2 latter is journaled in the head A as shown in Figs. 4 and 7. One of these pawlseither i or '1? 1s always in engagement wlth a tooth ofthe rack e toprevent the movement of the which i can only be elevated by turning thecrank e in the direction of the arrow shown in Fi 4. Just before therack e attains itshig lest point, the pin '6 secured in the side of therack e engages one end of the switch lever i and shifts the same so thatthe other end i of the lever leaves the stop-pin a and contacts withvthe stop-pin (1, which stopins are both secured lnside the pum -hea A.The shifting'into this position of tlie switchlever 11 causes thedisengagement of the pawl i from the teeth of the rack e, and theengagement of the pawl i with a toothof the same rack, so that now therack can only be moved downward, by rotating the crank e in the oppositedirection from that indicated by the arrow in Fig. 4;, until the rackreaches its lowermost position, when the pin e near the top of the rackwill shift the switch-l ever i into the position again as shown in Fig.4. The switch-lever i is provided with stops for the pawls i and i torest against and a spring i for each pawl tends to keep the latter inposition against the stops i The switch-lever i is held in oneor theother position by friction obtained by inserting a spring-washer 71between the switch-lever and the walls of the pump-head A.

To indicate or record the number of strokes of the piston b, anindicator of any. preferred make or style may be used and operatedby therack e. In Figs. 4, 5, 8 and 9, is shownan indicator and its actuatingmechanism, which are found simple and efficient; the indicator 0 shownis a Veeder, covered by U. S. Patent No. 548,482, of October 22, 1895,and is actuated by a lug e at the upper end of the rack e, whichcontacts with the lever 0 secured to the rock-shaft 0 j ournaled in thehousing 0 of the indicator 0; at the other end of the rock shaft 0 issecured an arm 0 to which is hinged a pawl 0 engaging the teeth of'theratchet-wheel 0 fastened to the shaft of the indicator 0; a spring 0 isemployed to turn the ratchet-wheel and indicator disks, while theupwardmovement of the rack e and lug e causes the rocking of the shaft 0against the action of the spring 0 and the engagement of the pawl o withthe next tooth of the ratchet-wheel 0.

rawn from the barrel can be ascertained.

with accuracyfrom the indicator 0 at any time, through the sight-hole aof the-pumphead A. V

Having thusdescribed the nature and obj ects of my invention, what Iclaim as new and desire to secure by Letters Patent is:

1. In a pump for drawing and measuring liquid the combination of thepiston-rod and its operating devices, with means for locking the rodagainst retrograde movement while moving in either direction, until thelimit of the travel of the rod has been reached, means for switching themeans for locking the rod when the latter moves in the oppositedirection, and an indicator to indicate the'number of strokes of thesaid rod, substantially as and for the purposes set forth.

2. In a pump for drawing and measuring liquid the combination of theiston-rod and its operating devices, a rack ormed on the piston-rod, aset of pawls, a switch-lever for said pawls, means for operating saidswitchlever, and an indicator forindicating the number of strokes of thepiston-rod, sub stantially as and for the purposes set forth. 3. In apum for the purpose described the combination 0 the piston-rod and itsoperating devices, a rack attached to said pistonrod, a gear-wheelmeshing with said rack and adapted to operate the same, a set of pawls,a switch lever controlling said pawls and actuated by pins on said rackto prevent the v movement of the rack in a direction opposite to that inwhich the gear-wheel forces the said rack, and an indicator adapted tobe" automatically operated by said rack, substantially as and for thepurposes set forth.

In witness whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

HENRY L. DARWOOD. Witnesses: A

THOMAS F. GEMER, NEAL G. SIMPSON.

